This is perhaps why neither side of the debate have picked up on this research. If you look at the WaPo[0] pie chart[1], it could also be reported as, "97% of gun crime committed using traceable firearms."

[0] https://www.washingtonpost.com/news/wonk/wp/2016/07/27/new-e...

[1] https://img.washingtonpost.com/blogs/wonkblog/files/2016/07/...